Greg Ames wrote:
I noticed that multiple packets are being sent to the network when one
would do on a couple of Linux 2.6.x boxes. one is SuSE SLES 9, the
other is RHEL 4. the first packet is all the HTTP headers, the second
is the body/file. strace
http://people.apache.org/~gregames/rhel4.cork.strace reveals that
httpd is issuing the correct setsockopt()s to enable/disable
TCP_CORK. no such problem seen on 2.4 kernels.
here is a packet trace in pcap/tcpdump binary format
http://people.apache.org/~gregames/rhel4.cork.tcpdump
Nivedita, are you aware of any bugs like this?
if you want to try this with Apache 2.x, use a file that's bigger than
256 bytes so that core_output_filter will use sendfile, but small
enough so that the HTTP headers + file will fit into one ethernet packet.
Greg
FWIW, I just tested this out on FreeBSD 6.0-CURRENT and 2.1.6, and it
behaves correctly. It sends the headers in the same packet as the
Sendfile()'ed data. Sure sounds like a Linux specific issue.
-Paul
